fix tests

tests/unit/data-test.js

@@ -1,7 +1,17 @@
-import { module, test } from "qunit";
-import DS from "ember-data";
-import { getContext } from "@ember/test-helpers";
-import { setupApplicationTest } from "ember-qunit";
+import { module, test } from 'qunit';
+import DS from 'ember-data';
+import { getContext } from '@ember/test-helpers';
+import { setupApplicationTest } from 'ember-qunit';
+import { get as emberGet } from '@ember/object';
+import { gte } from 'ember-compatibility-helpers';
+
+function get(obj, key) {
+  if (gte('3.1.0')) {
+    return obj[key];
+  } else {
+    return emberGet(obj, key);
+  }
+}
 
 function getService(name) {
   return getContext().owner.lookup(`service:${name}`);
@@ -12,50 +22,48 @@ function register(registeredName, object) {
 }
 
 function stubAdapter() {
-  let store = getService("store");
+  let store = getService('store');
   store.createRecord('post', { name: name1 });
   store.createRecord('post', { name: name2 });
 }
 
-let name1 = "Rails is omakase";
-let name2 = "The Parley Letter";
+let name1 = 'Rails is omakase';
+let name2 = 'The Parley Letter';
 let expectedNames = [name1, name2].join();
 
-module("ember-data", function(hooks) {
+module('ember-data', function(hooks) {
   setupApplicationTest(hooks);
 
-  test("attr", async function(assert) {
+  test('attr', async function(assert) {
     let Post = DS.Model.extend({ name: DS.attr() });
     register(`model:post`, Post);
     stubAdapter();
 
-    let store = getService("store");
-    let posts = await store.peekAll("post");
-    let names = posts.toArray().map(post => post.name).join();
+    let store = getService('store');
+    let posts = await store.peekAll('post');
+    let names = posts
+      .toArray()
+      .map(post => get(post, 'name'))
+      .join();
 
-    assert.equal(
-      names,
-      expectedNames,
-      "The correct records are in the array"
-    );
+    assert.equal(names, expectedNames, 'The correct records are in the array');
   });
 
-  test("@attr", async function(assert) {
+  test('@attr', async function(assert) {
     let Post = class extends DS.Model {
       @DS.attr() name;
-    }
+    };
 
     register(`model:post`, Post);
     stubAdapter();
 
-    let store = getService("store");
-    let posts = await store.peekAll("post");
-    let names = posts.toArray().map(post => post.name).join();
+    let store = getService('store');
+    let posts = await store.peekAll('post');
+    let names = posts
+      .toArray()
+      .map(post => get(post, 'name'))
+      .join();
 
-    assert.equal(
-      names,
-      expectedNames,
-      "The correct records are in the array"
-    );
+    assert.equal(names, expectedNames, 'The correct records are in the array');
   });
 });